Make the project build with Microsoft's broken C compiler.

MSVC is not fully C11-compliant, even when compiling with /std:c11.
Some changes were needed to make the codebase compatible. Notably, the
notation a[static N] and a[n] for function parameters of array type is
not supported, so that had to be hidden behind a macro.  Atomic types
are also an experimental feature, apparently, but at least they work
with the correct compiler flag.

One thing that MSVC does well, however, is warning on integer conversions
on /W4 level. I am not sure if Clang and GCC have something similar,
so I took this chance to fix some of these.

1 files changed, 1 insertions, 1 deletions

diff --git a/test/011_math_indextoperm/indextoperm_tests.c b/test/011_math_indextoperm/indextoperm_tests.c
index e83cbad..1464d7b 100644
--- a/test/011_math_indextoperm/indextoperm_tests.c
+++ b/test/011_math_indextoperm/indextoperm_tests.c
@@ -1,6 +1,6 @@
 #include "../test.h"
 
-void indextoperm(uint64_t, size_t n, uint8_t [n]);
+void indextoperm(uint64_t, size_t n, uint8_t *);
 
 void run(void) {
         char str[STRLENMAX];